JavaScript Global Variable

Syntax

var variableName = value;

Example

var car = "Toyota";
function myFunction() {
  console.log(car);
}

myFunction(); // Output: "Toyota"

Output

Toyota

Explanation

A global variable is a variable that is available throughout the entire JavaScript program, both inside and outside of functions.

In the example above, the variable car is defined globally and can be accessed both inside and outside of the myFunction function.

Use

• Global variables can be used to store data that needs to be accessed by multiple functions throughout the program.
• They can be used to store configuration settings for the entire program.

Important Points

• Global variables should be used with caution as they can lead to naming conflicts and make code harder to maintain.
• It is better to use local variables whenever possible, and pass data between functions using function parameters and return values.

Summary

In this section, we discussed JavaScript global variables, their syntax, example, output, and explanation. We also talked about the use, important points, and summary of global variables in JavaScript.